Grate-bar



(No Model.)

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ATTORNEYS Patented Apr. 14, 1896.

UNITED STATES i PATENT OFFICE.

DANIEL KRIDLER, OF VILKESBARR, PENNSYLVANIA.

G RATE-BAR.

SPECIFICATION forming part of Letters Patent No. 558,185, dated April 14, 1896. 4 Application filed November 16, 1895. Serial No. 569.190. (No model.)

To all whom t may concern:

Be it known that I, DANIEL KRIDLER, of VilkesBarr, in the county of Luzerne and State of Pennsylvania, have invented an Improvement in Grate-Bars, of which the following is a specification.

This invention is an improved grate for steam-boilers or other furnaces, the obj ect being to provide a grate which will support the fuel to be burned, through which air may be fed or forced t0 permit combustion of said fuel.

Another object is to construct a grate of a series of Whole grate-bars through which air -may be fed and which are of such construction that when properly 'united they form an.

unbroken surface to support lthe fuel.

Another object is to construct the grate with a rear dumping-section, for the purpose of facilitating the cleaning of such grate.

With these objects in view and such others as may hereinafter appear my invention consists in the peculiar construction of the various parts and the novel manner of combining or arranging such parts, all of which will be fully described hereinafter, and pointed out in the claims.

In the drawings forming a part of this specification, Figure 1 is a view showing the grate constructed in accordance with my invention. Fig. 2 is a view of one of the gratebars. Fig. 3 is a detail view showing the :manner of connecting the front and rear sections of said bar. Fig. 4 is a sectional view showing the manner of connecting the grate-bars to each other.

In constructing my improved grate A, I employ a series of grate-bars B, each composed of a front section b and the rear section b.

The grate-bars may be constructed of any desirable material, and are usually made about four inches wide and six feet long, the forward section being four feet long and the rear section two feetlong.

Each grate-bar is composed of a flat top h2, the transverse tubular portion b3, and the lon` gitudinal tubular portion b4, said tubular portions being essentially-semicircular in shape and communicating with each other, as clearly shown. .y

The top of the grate -bar is perforated throughout its length to the rear of the line X, which indicates the rear edge of the transverse tubular portion, and it will be noticed that the top portion extends laterally upon each side beyond the lower or tubular portion, and these extended portions are also provided with perfor-ations, as clearly shown in Fig. 4. The transverse portions are provided with flanges C, by means of which the gratebars are connected to each other to provide an unbroken surface.

The rear section of grate-bar is constructed substantially the same as the forward section, except that it is closed at its rear end and has no transverse portion at the forward end, but at said forward end is provided with a flange D, which rests beneath the rear end of the forward section and forms a tight joint between the front and rear sections. The rear sections are connected at their rear ends to a rock-bar, and upon the under side of said sections is arranged a dumping-bar .adapted to be operated by a crank-lever extending outside of the furnace, so that Whenever it is desired to dump the rear 'section of grate it is only necessary to operate said handle, and the rear section of grate, composed of the rear sections of grate-bars, will be dumped forwardly, the forward sections remaining stationary.

'lhe air-blower is connected at one side to the transverse air-duct of the grate, and as the air is forced therefrom it is distributed along the entire length of each grate-bar and is forced upward through the perforations into the fuel.

Now in air-feeding grates as usually constructed they are operated with the ash-pit doors closed, and the only air conveyed to the fuel is through the medium of a forcing apparatus and through the tubes of the gratebars. Now it will be noticed that between each tubular portion of the grate-bars are arrangedthe abutting iianges or side portions of the top of grate-bar, which portions are perforated so that at least three rows of perforations are provided and through which air entering through the ash-pit doors can be conveyed to the fuel. This construction enables me to supply a greater quantity of air to the fuel, and also requires a less quantity of air to be forced through the grate by means of the air-forcing apparatus.

Now in operation the fuel is fed upon the IOO grate the same as usual and the air-blast fed thereto through the single transverse chamber and the series of longitudinal chambers, said transverse chamber being closed at the top while the longitudinal chambers are open at the top,thus forcing the air upward through the fuel.

When it is desired to clean the grate, all or nearly all of the fire is raked out at the furnace-door and then the rear section of the grate is dumped forwardly. This action dumps all the ashes contained in the rear section, and by applying the air or steam jet to the forward section all ashes which have dropped through into the tubes will be forced rearward into the ash-pit. The rear section is then raised again and the grate is ready for operation.

each side beyond the longitudinal channel, so that the tops of adjacent bars contact, said laterally-extended portions being perforated also, substantially as shown and described.

2. An improved grate, composed of a series of bars, each bar being made in two sections, the forward sections being fixed and composing the transverse and longtiudinal channel, the r'ear sections being arranged to dump and having only a longitudinal channel, the tops of said bars being perforated over the longitudinal channels, substantially as shown and described.

3. An improved grate, comprising a fixed front section, a dumping rear section, said sections being composed of a series of gratebars bolted together at their front and rear ends, each bar comprising a perforated top and the tubular lower portion, and means for dumping the rear section, substantially as shown and described.

In testimony whereof I affix my signature in the presence 0E two witnesses.

DANIEL KRIDLER. lVitnesses:

JAMEs Il. SHEA, JOSEPH KELLER. 

